﻿// Copyright 2006 - Ricardo Stuven (rstuven@gmail.com)
//
// This file is part of MsSqlSpatial.
// MsSqlSpatial is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// MsSqlSpatial is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public License
// along with MsSqlSpatial; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

using System.Data.SqlTypes;
using GeoAPI.Geometries;
using Microsoft.SqlServer.Server;
using MsSqlSpatial;

public partial class UserDefinedFunctions
{
    /// <summary>
    /// Find and return the number of points in the first linestring in the geometry. 
    /// Return NULL if there is no linestring in the geometry.
    /// </summary>
    /// <param name="wkb"></param>
    /// <returns></returns>
    [SqlFunction(IsDeterministic = true)]
    public static SqlInt32 NumPoints(SqlBytes ewkb)
    {
        IGeometry geometry = ConvertGeometry.ToGeometry(ewkb);
        if (geometry != null)
        {
            if (geometry is IPoint || geometry is IMultiPoint)
                return 1;
            else if (geometry is IGeometryCollection)
                return (geometry as IGeometryCollection).Geometries[0].NumPoints;
            else
                return geometry.NumPoints;
        }
        return SqlInt32.Null;
    }
} ;